// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_REMOTING_REMOTING_CDM_CONTROLLER_H_
#define MEDIA_REMOTING_REMOTING_CDM_CONTROLLER_H_

#include "base/callback.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/thread_checker.h"
#include "media/remoting/remoting_source_impl.h"

namespace media {

// This class controlls whether to start a remoting session to create CDM.
// The |remoting_source_| will be passed to the RemotingRendererController when
// the CDM is attached to a media element.
class RemotingCdmController final : public RemotingSourceImpl::Client {
public:
    explicit RemotingCdmController(
        scoped_refptr<RemotingSourceImpl> remoting_source);
    ~RemotingCdmController();

    // RemotingSourceImpl::Client implementations.
    void OnStarted(bool success) override;
    void OnSessionStateChanged() override;

    // Returns whether we should create remoting CDM via |cb|, which could be run
    // synchronously or asynchronously, depending on whether the required
    // information is available now or later.
    using CdmCheckCallback = base::Callback<void(bool is_remoting)>;
    void ShouldCreateRemotingCdm(const CdmCheckCallback& cb);

    RemotingSourceImpl* remoting_source() const
    {
        DCHECK(thread_checker_.CalledOnValidThread());
        return remoting_source_.get();
    }

private:
    const scoped_refptr<RemotingSourceImpl> remoting_source_;

    // This callback is run once to report whether to create remoting CDM.
    CdmCheckCallback cdm_check_cb_;

    // Indicates if the session is in remoting.
    bool is_remoting_ = false;

    base::ThreadChecker thread_checker_;

    DISALLOW_COPY_AND_ASSIGN(RemotingCdmController);
};

} // namespace media

#endif // MEDIA_REMOTING_REMOTING_CDM_CONTROLLER_H_
